Download Event Information
Origin
PublicID |
2020p008930 |
UTC Time |
2020-01-04T07:18:19Z |
Latitude |
-36.74 (± 7.2
km)
|
Longitude |
176.94 (± 6.1
km)
|
Depth |
309 km (± 6 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
81 |
Used Station Count |
73 |
Standard Error |
1.78 (s) |
Azimuthal Gap |
189.23 (degrees) |
Minimum Distance |
0.78 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.9 |
|
MLv |
4.9 (± 0.4) |
54 |
M |
4.9 |
54 |
GeoNet combines magnitudes into a summary magnitude, M, which consists of a weighted average of the individual magnitudes and attempts to be a best possible compromise between all magnitudes for a range of earthquake sizes.
Summary magnitude for GeoNet is then defined as:
M = (2 * MLv + (0.4 * number_of stations(Mw(mB)) - 1) * Mw(mB)) / (2 + (0.4 * number_of_stations(Mw(mB)) - 1))
Where MLv is local magnitude calculated on the vertical component and Mw(mB) is a Mw estimation based of mB by Bormann and Saul (2008).